Operation Manual

6.72 Sample & Hold 133
Figure 78: Use of RMS in Vocoder.
6.72 Sample & Hold
The Sample & Hold module performs a sample & hold function. It has two
inputs, the first a triggering signal and the second the signal to be sampled. The
module has one output which holds the last sampled value of the second input. The
second input is sampled every time a low-to-high transition is detected in the signal
of the first input. The level of a signal is considered to be “high” for amplitudes
above 0.75 Volts while it is considered to be “low” for values below 0.25Volts. The
signal of the first input must drop again (below 0.25V) before it can trigger another
sample. This prevents minor variations (less than 0.5V) in the gate signal, due to
noise, from triggering a new sample. The hold button on the front panel is used to
manually sample the input signal independently of the value of the gate signal.
Typical Use
The Sample & Hold can be used with two LFOs for generating pseudo-random signals as shown in
Figure 80. One LFO acts as the trigger of the Sample & Hold module while the second generates
the signal to be sampled.